GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

mm: remove rest of ACCESS_ONCE() usages

Browse source 
We converted some of the usages of ACCESS_ONCE to READ_ONCE in the mm/
tree since it doesn't work reliably on non-scalar types.

This patch removes the rest of the usages of ACCESS_ONCE, and use the new
READ_ONCE API for the read accesses.  This makes things cleaner, instead
of using separate/multiple sets of APIs.

Signed-off-by: Jason Low <jason.low2@hp.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jason Low 2015-04-15 16:14:08 -07:00 • committed by Linus Torvalds
parent 9d8c47e4bb
commit 4db0c3c298
11 changed files with 33 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

6
mm/rmap.c
View file

@ -456,7 +456,7 @@ struct anon_vma *page_get_anon_vma(struct page *page)
unsigned long anon_mapping;
rcu_read_lock();
anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping);
anon_mapping = (unsigned long)READ_ONCE(page->mapping);
if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
goto out;
if (!page_mapped(page))
@ -500,14 +500,14 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page)
unsigned long anon_mapping;
rcu_read_lock();
anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping);
anon_mapping = (unsigned long)READ_ONCE(page->mapping);
if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
goto out;
if (!page_mapped(page))
goto out;
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
root_anon_vma = ACCESS_ONCE(anon_vma->root);
root_anon_vma = READ_ONCE(anon_vma->root);
if (down_read_trylock(&root_anon_vma->rwsem)) {
/*
* If the page is still mapped, then this anon_vma is still